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how to fix "Mailbox unavailable. The server resposne was: 5.7.1....."

on a form submission  we are getting the following (Also attached screenshot) message.

MailBox unavailable. The server response was:5.7.1.... See attached image for details. Any solutions?

we are using IIS 6 in windows 2003 server
Avatar of Manpreet SIngh Khatra
Manpreet SIngh Khatra
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Is this some kind of Application trying to relay data through some Email server ?
Was there some changes to server or application ? was it working earlier ?

- Rancy
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Rose Babu
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